@article{article9ad40098,
title   = {Double mutagenesis of a positive charge cluster in the ligand-binding site of the ferric enterobactin receptor, FepA},
author = {Newton, Salete Maria Cardozo and Allen, J S and Cao, Z and Qi, Z and Jiang, X and Sprencel, C and Igo, J D and Foster, S B and Payne, M A and Klebba, P E},
year = {1997},
doi = {10.1073/pnas.94.9.4560},
journal   = {Proceedings of the National Academy of Sciences of the United States of America}
}